Contact closer



June 17, 1930. Q S N I 1,764,819

CONTACT CLOSER .Filed Dec. 15,, 1927 Jzuenr: J filaensom Patented June 17, 1930 QA RL ANDERSON, OF CHICAGO, ILLINOIS con'mcr CLOSER Application filed December 15, 1927. Serial No. 240,124.

'My invention relatesto contact closers, and has for its object improvement in such devices. More particularly it relates to eliminating jar from the support of the device by absorbing .such jar within the magnet and armature which constitute the contact closer. Y r

In the accompanyingdrawings Fig. 1 is a front elevation on my device; 10 and Fig. 2 is a side elevation.

Secured to body 10, ofslate or other insulation, is a bracket :11 which carries a pin 12.1 Pivoted upon the pin 12 are side plates 13 between which-are secured the laminae 14 whichconstitute thecore of'the magnet. The coil .15 of the magnet is held in place by -keepe'rs' lG-which are secured to lugs 17 on the-"side plates 13; V

secured ibetween "other side plates 18 are thelaminae .19- which constitute the armatureflof themagnet .The lower ends of the ,side plates 18f have v bosses 20 which extend outside gof the side plates .13 a and are also pivoted on the pin 12... fAt their lower ends beyond 1 the-pin '12, the. side "plates 13 have extensions 21 which comeinto contact with the lower outer-corners offlthe side plates 4 andflimit lthe distance which the arma- 80 turefand magnetmay move from each other when turning on',,t he pivot. 12. 1

On the uppergfooutercornersof the side plates '18 arebosses 22 and secured to these bosse Brack n; havin a its upperendr er V is'"a;1socket'or holder 26 whichfsupportsja earbonfcontact member 27 havinga limited movement in the holder 26 by reason of a pin 28 operating in a slot 1299i Behind I the member 27 is a sprin 3Q whichfoperates toflhold the member.;2 the position shown in the draw f k t I y f arts are so arranged that when thefarn ature i's attr'acted, the contact 25 strikestlie Contact; 27Qa nd .compresses the spring l 0".toafsinall 'e ens. e

9 i e'd1t {th Slat .0, h magnet is: asmallfbracket 31".which. extends over a small projection 32 on the upper corner of one or both side pieces 13. These parts are so arranged that the magnet, including side pieces 13, core 14 and coil 15, have a limited movement on the pivot pin 12.

By observing the location of the pivot pin 12, as shown in Fig. 2, it will be seen this pin is below the magnet and its armature,

and a little off of the center line between normally rests against the slate 10 with a very light pressure. When a current flows thru the coil 15, the magnet and armature attract each other with an equal force, and because both are pivoted on the same pin, they move toward each other until such motion is stopped by contact between them, or by some other means.

Because the magnet is heavier than the armature, it moves less rapidly under the attractive forcebetween the two. And because the center of mass of the magnet is further from the vertical plane extending thru the axisof the pin 12 than is the center of the mass of the armature, there is a second reason why the magnet moves more. slowly under the attractive force between the two. However, the parts are so balanced that, if the slate 10 is vertical, each part will move toward the other. Also, this balance and the bracket 31 are so related that, under the attractive force used, the armature and magnet come into contact with each other just as, or just before the projection 32 reaches the bracket 31'.v v

As the two bodies'are attracted toward each other with the same force, they will meet withthe same momentum, and will stop stationary at the instant of contact -with each other. This is not quite true in this construction because the magnet is lifted a greater distance against gravity by reason of the eccentric position of the pin 12. Subtracting the gravitational force from the attractive force, the momentum of the armature is slightly greater than the momentum of magnet, and the result is that, upon collision, the entire mass moves slightly to the right as seen in Fig. 2. As a consequence, there is no blow of the projection 32 striking the inner face of the bracket 31.

But just before the magnet and armature come into contact with each other, the contact member 25 strikes the member 27 and compresses the spring 30. The action of this spring is then to check the retractive movement of the mass to the right, and to move the projection 32 to, and hold it against, the inner face of the bracket 31.

When the circuit is broken thru the coil 15, the spring 30 acts as an armature retracting spring, and avity acts to move armature and magnet rom each other. The same balancing arrangement which. served to bring magnet and armature together in a manner to cause the momentum of one to counteract the momentum of the other, acts here to produce the same result by the armature striking the rojecting extensions 21. This occurs just eiore the rojection 31 comes into contact with the s ate 10, with the result that the parts settle into the position shown in Fig. 2 without concussion.

Reviewing the operation it will be seen that magnet and armature move toward each other from positions of rest to mutual contact with the contacting parts free in space so that each absorbs the momentum of the other. Also, that the same thing occurs when they move from each other.

Parts 25 to 30 are well known structures, and are'described here just enou h to show that the spring 30 is a retractive orce which is taken into consideration in that balancing of parts which eliminates concussion. Electrical connections are shown for the coil 15 and for the contacts 25 and 27, but these will be self-evident from the drawings.

What I claim is 1. In a contact closer, a pivotal support, a magnet and armature mounted on said support and each independently movable on it as a pivot, retracting means for separating armature and magnet, and stopping means by which the momentum of one part absorbs that of the other part.

2. A magnet and armature movable toward and from each other, electrical connectlons for energizing the magnet to cause the two to move toward each other, retracting means for causing the two to move from each 7 other when the magnet is de-energized, and

mutual stopping means for causing the momentum of one part to absorb the momentum a magnet of the other part at the termination of both attraction and retraction.

3. A magnet and armature movable toward and from each other, means for causing the two to move simultaneously toward and from each other, mutual stopping means carried by the parts, and limiting devices for confining the movements of said parts within prescribed spaces.

4. A ivotal support, a magnet pivotally mounte upon said-support and having its center of gravity above and to one side of such pivot, an armature similarly mounted and having its center of ravity above and on the opposite side of t e pivot, limiting means for restraining pivotal movements of the magnet within a prescribed space, and a stop carried by the magnet and serving to limit the movement of the armature from the magnet.

5. A pivot, a magnet mounted to move on said pivot and having its center of gravity above and to one side of said pivot, an annature also mounted on said pivot and having its center of gravity above and to the other side of said pivot, electrical connections for energizing said magnet so as to cause magnet and armature to move toward each other, mutual stopping means for limiting such attractive movements, a spring placed under tension by the attractive movement and serving to separate magnet and armature when the ma net is de-energized, mutual stopping means or limiting the retractive movements, and confining means for retaining the magnet and armature'so that their centers of gravity will remain as before stated.

6; A magnet and armature supported so I that the action of gravity tends to cause them to fall away from each other, mutual stopping means serving to limit the distance the ma et and armature can move from each at er, electrical connections for energizing the magnet to cause magnet and armature to move toward each. other, a spring placed under tension by the attractive movement and serving to initiate a retractive movement, and confining means for retaining all movements within a prescribed space,

In an electro-magnetic device comprising a magnet and an armature, a pivotal support for said magnet so that it may move toward the armature when energized, and a stop for limiting such movement of the magnet.

8. A magnet, and an armature arranged to strike said magnet when the magnet is energized, said magnet being free to recede when so struck so that the momentum of' the moving armature will be absorbed by the inertia of the mass of the magnet. 9. In an elevator control device, a body of insulation, a bracket secured to said body,

able on said pivot to and from contact with pivoted to said bracket and mov said body, a stop for limiting the movement of themagnet from said body, and an armature for said magnet, said armature having its movement in the same direction as the movement of the magnet.

10. The combination with a body of insulation such as a slate secured to a wall, a powerful magnet supported on said insulation, and a heavy armature movable by said magnet to deliver a heavy blow upon the core of said magnet, said parts being so constructed that the attraction of the ma et serves to prevent the jar of such blow 0 being conveyed to said insulation and its support.

CARL ANDERSON. 

